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4Q 2015 Analog Applications Journal Introduction Analog Applications Journal Fourth Quarter, 2015 © Copyright 2015 Texas Instruments Incorporated. All rights reserved. Analog Applications Journal Contents Introduction . 3 Automotive Understanding frequency variations in the DCS-Control™ topology ............... .4 The DCS-Control™ topology is an example of an on-time based topology that efficiently provides the low-noise and fast-transient response needed in many automotive applications. This article presents operational details with application examples for this topology to explain the factors that cause frequency variation. Industrial VCM vs. VOUT plots for instrumentation amplifiers with two op amps . 8 Common issues with instrumentation amplifiers include distorted output waveforms, incorrect device gain, or ‘stuck’ outputs. This article introduces the VCM vs. VOUT plot and delivers a thorough treatment of the two op-amp topology. The internal node equations are derived and used to plot an internal amplifier’s input common-mode and output-swing limits as a function of the instrumentation amplifier’s common-mode voltage. A software tool that simulates the VCM vs. VOUT plot is also introduced. Common-mode transient immunity for isolated gate drivers. .13 A gate driver with good common-mode transient immunity (CMTI) supports faster switching speeds. This article gives the background for a general pulse-width modulation (PWM) scheme, the transition loss associated with high switching frequency, and provides isolated gate-driver solutions that can reduce transition time losses. Pushing the envelope with high-performance digital-isolation technology. 18 Traditional fiber-optic and magnetic isolation solutions can now be replaced with capacitive-based digital and analog devices for reinforced isolation applications. This article discusses key end applications that are driving cutting-edge innovations in isolation technology and benefitting from these innovations. Communications How to reduce current spikes at AC zero-crossing for totem-pole PFC. .23 The current spikes at AC zero-crossing have prevented the totem-pole PFC from being widely adopted. The causes for current spikes are complicated: turn-on sequence, slow reverse recovery of a MOSFET’s body diode, large COSS of MOSFETs, sudden turn on of the active FET with almost 100% duty cycle, sudden turn on of the sync FET, and so on. Four scenarios for common problems are covered in this article. Then, a solution that significantly reduces current spikes and improves THD is presented with a timing analysis and performance waveforms. Personal Electronics Faster, cooler charging with dual chargers. .27 Demands for higher charge current and smaller device size have increased the thermal management issues for chargers. This article describes how I-FET dual chargers, either in a parallel or cascade configuration as the application allows, gives better heat distribution for lower IC and case temperatures in addition to faster, cooler charging and longer device run times. TI Worldwide Technical Support . .31 To view past issues of the Analog Applications Journal, visit the Web site: www.ti.com/aaj Subscribe to the AAJ: www.ti.com/subscribe-aaj Texas Instruments 2 AAJ 4Q 2015 Analog Applications Journal Introduction The Analog Applications Journal (AAJ) is a digest of technical analog articles published quarterly by Texas Instruments. Written with design engineers, engineering managers, system designers and technicians in mind, these “how-to” articles offer a basic understanding of how TI analog products can be used to solve various design issues and requirements. Readers will find tutorial information as well as practical engineering designs and detailed mathematical solutions as they relate to the following applications: • Automotive • Industrial • Communications • Enterprise Systems • Personal Electronics AAJ articles include many helpful hints and rules of thumb to guide readers who are new to engineering, or engineers who are just new to analog, as well as the advanced analog engineer. Where applicable, readers will also find software routines and program structures and learn about design tools. These forward-looking articles provide valuable insights into current and future product solutions. However, this long-running digest also gives readers archival access to many articles about legacy technologies and solutions that are the basis for today’s products. This means the AAJ can be a relevant research tool for a very wide range of analog products, applications and design tools. Texas Instruments 3 AAJ 4Q 2015 Analog Applications Journal Automotive Understanding frequency variation in the DCS-Control™ topology By Chris Glaser Applications Engineer Introduction As explained in Reference 1, the timer (tON_MIN) is A common requirement in the automotive market is to responsible for providing a controlled switching frequency avoid interfering with the AM radio band or other sensitive by adjusting the on-time based on VIN and VOUT through electronics, such as sensors. One example for power Equation 1. supplies is setting their switching frequency above ~1.8 MHz VOUT in order to keep all noise at a higher frequency than the t = × 400 ns (1) ON V highest AM radio signals. IN If the frequency is set below the lowest radio signals, The 400-ns value sets the ideal switching frequency to then higher frequency harmonics would be in band and 2.5 MHz when the DCS-Control device is operating with possibly interfere. Most modern power supplies do not use the on-time set by the timer. However, due to circuit an actual oscillator to set their switching frequency, as in losses, propagation delays, and in some specific applica- traditional voltage- or current-mode control. Instead, tion conditions, operation does not always follow the either the on-time or off-time is controlled, which then on-time set by the timer. As a result, the frequency varies. provides a relatively constant operating frequency. The reasons for this variation are grouped together based DCS-Control™ topology is an example of an on-time on the duty cycle, ideally VOUT/VIN, at which the device based topology which efficiently provides the low-noise operates. and fast-transient response needed in many automotive Measured data explains the principles behind the applications. While its switching frequency does vary, this DCS-Control topology’s frequency variation. To better variation is understood, controlled, and usually sufficient explain the concepts, the TPS62130 (catalog version) was for automotive and other frequency-sensitive applications. chosen and it offers two switching frequencies: 2.5 MHz and 1.25 MHz. The 2.5-MHz data exactly matches the Application example TPS62130A-Q1 data because both converters offer the Figure 1 shows the basic block diagram of the 2.5-MHz setting. All data was taken on the evaluation DCS-Control topology used in a typical automotive info- module with a 2.2-µH inductor and two 22-µF output tainment device.[1, 2] capacitors (to overcome the DC bias effect).[3] Figure 1. Block diagram of the DCS-Control™ topology in the TPS62130A-Q1 converter Gate Control Driver Direct Control VOS and Ramp Compensation – FB Comparator Timer (tON_min) Error Amplifier + VREF 0.8 V DCS-ControlTM Topology Texas Instruments 4 AAJ 4Q 2015 Analog Applications Journal Automotive Moderate duty cycles Figure 2. TPS62130 with a 5-V output In the typical application of converting the 12-V car battery to 5 V for universal serial bus (USB) ports, the 3.0 required duty cycle is not extremely high or low. Frequency variation in this case is very low because the 2.5 on- and off-times are not at their extremes. Figure 2 2.5 MHz_3 A shows the measured switching frequency, on-time, and 2.5 MHz_1 A off-time with a 5-V output voltage, two frequency settings, 2.0 and two different load currents. A moderate duty cycle refers to those input voltages above 9 V for the 2.5-MHz 1.5 setting and above 7 V for the 1.25-MHz setting. 1.25 MHz_3 A Figure 2b shows the reason behind the low levels of 1.0 1.25 MHz_1 A frequency variation. The on-time matches very well to the ideal on-time set by the timer and to Equation 1 for both Switching Frequency (MHz) 0.5 loads and frequency settings. The reasons for the small 0 frequency variation with moderate duty cycles are: over- 5 6 7 8 9 10 11 12 13 14 15 16 17 coming losses and propagation delays. Input Voltage (V) In Figure 2a, the frequency increases with heavier loads due to losses. Higher loads require slightly higher duty (a) Switching frequency cycles to overcome resistive losses in the circuit. Since the on-times are the same for both the 1-A load and 3-A load, 1000 the off-time is decreased to achieve the higher duty cycle 1.25 MHz_3 A_On_Time 900 (Figure 2c). The same on-time and a shorter off-time 1.25 MHz_1 A_On_Time results in a shorter period and higher frequency. 800 1.25 MHz_Ideal Also, the frequency decreases slightly with increasing 2.5 MHz_3 A_On_Time 700 input voltage. Because the on-time decreases with increas- 2.5 MHz_1 A_On_Time ing input voltage, fixed propagation delays in the device 600 2.5 MHz_Ideal have a more significant effect on the achieved on-time for ime (ns) smaller on-time values. The timer sets the on-time to 500 achieve a certain frequency, but its output signal goes On-T 400 through the control and gate driver (shown in Figure 1) 300 before reaching the power transistors. This path takes some finite amount of time. For example, if a 200-ns 200 on-time is desired and the propagation delay is 20 ns, the 100 actual on-time is 220 ns, which is 10% higher than desired. 5 6 7 8 9 10 11 12 13 14 15 16 17 But, if the input voltage increases and the desired on-time Input Voltage (V) reduces to 100 ns, the same 20-ns delay produces a 20% (b) On-time increase in the actual on-time.
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